John Whiteclay Chambers II. "Post Traumatic Stress Disorder." The Oxford Companion to American Military History. Oxford University Press. 2000. Encyclopedia.com. 27 Dec. 2009 <http://www.encyclopedia.com>.
John Whiteclay Chambers II. "Post Traumatic Stress Disorder." The Oxford Companion to American Military History. Oxford University Press. 2000. Encyclopedia.com. (December 27, 2009). http://www.encyclopedia.com/doc/1O126-PostTraumaticStressDisrdr.html
John Whiteclay Chambers II. "Post Traumatic Stress Disorder." The Oxford Companion to American Military History. Oxford University Press. 2000. Retrieved December 27, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O126-PostTraumaticStressDisrdr.html